AWS has announced RDS root certification rotation, and old cert will expired on Mar 5, 2020
09:11
UTC+0
16:11
UTC+7, Jakarta time
17:11
UTC+8, Singapore time
14:41
UTC+5:30, Bangalore time
Please notify your on-call team to closely monitor your application service that's using AWS RDS or even product-related metrics to see whether your service it's affected by expiration of RDS old certificate.